VizieR Online Data Catalog: Hα survey in the ONC (Szegedi-Elek+, 2013)

We observed the ONC, centered on the Trapezium, with the Wide Field Grism Spectrograph-2 (WFGS2) installed on the University of Hawaii 2.2m telescope, on the five nights of 2010 December 31, 2011 January 2, 2011 January 25, 2011 February 27, and 2011 October 16. We covered an area of almost 1deg² centered on RAJ2000=5:35:16.4 and DEJ2000=-5:23:25 with a mosaic of 25 overlapping fields. We used a 300line/mm grism blazed at 6500Å and providing a dispersion of 3.8Å/pixel and a resolving power of 820. The Hα filter had a 500Å passband centered near 6515Å.

Direct images of each field of the mosaic with the same instrument were obtained through r' and i' filters immediately before the spectroscopic exposures. One exposure was taken at each position and in each filter with integration time of 60s.

(3 data files).